.clearfix:after{
    content:"";
    display: block;
    clear:both;
}

ul{
    list-style: none;
    margin: 0;
}

.logo a{
    text-decoration: none;
    letter-spacing: 1px;
}

header{
    background: rgba(0,0,0,0.3);
}

nav{
    /*background:#ccc;*/
    background: transparent;
    height:50px;
}

#banner{
    /*background:#777;*/
    background: transparent;
    height:700px;
}

nav ul{
    list-style: none;
    margin:0;
    float:right;
}

nav ul li,nav .logo{
    display: inline-block;
    line-height:50px;
    margin-right:20px;
    padding-left: 10px;
}

nav ul li a{
    display:inline-block;
    line-height: 50px;
    text-decoration: none;
    height:inherit;
    color:#fff;
}

nav ul li.logo{
    float:left;
}

p{
    font-size: 18px;
    letter-spacing: 1px;
}

#banner .inner{
    max_width:300px;
    text-align: center;
    margin:0 auto;
    position: relative;
    top:160px;
}

#banner .inner h1{
    margin:0;
}

button{
    border:none;
    background:#333;
    color:#eee;
    padding:14px 60px;
}

#banner button{
    padding:14px 60px;
}

#banner .inner .more{
    margin-top: 280px;
}

.sub-heading{
    line-height: 30px;
    margin:30px 0;
    color:white
}

.logo{
    font-size: 20px;
    font-weight: 700;
    letter-spacing:1px;
}

.logo a{
    color: #fff;
}

h2{
    font-size: 30px;
}

h3{
    font-size: 24px;
}

#main-btn{
    padding: 14px 28px;
    font-size: 20px;
    letter-spacing: 4px;
    border-radius:6px;
    background:#252f34;
}

.green-section{
    background: #252f34;
    text-align: center;
    color:#fff;
    padding: 100px 0;
}

.wrapper{
    max-width:1080px;
    margin: 0 auto;
}

.hr{
    width:100%;
    height: 2px;
    margin:20px 0;
}

.sub-heading{
    font-size: 18px;

}

.green-section .hr{
    background: cadetblue;
    margin:0 auto;
    width:60%;
}

.green-section .icon-group .icon{
    display:inline-block;
    width:80px;
    height:80px;
    border:1px solid black;
    transform: rotate(45deg);
    margin: 20px;
}

.icon-group{
    margin: 20px;
}

.gray-section{
    background: #252f34;
    color:#fff;
}

.gray-section .img-section{
    width:45%;
}

.img-section img{
    width:100%;
}

.gray-section .text-section{
    width:55%;
}

.article-preview > div{
    float:left;
    font-size: 0;
}

.article-preview:after{
    content:"";
    display: block;
    clear:both;
}

.article-preview:nth-child(odd){
    background-color: rgba(255,255,255,0.05);
}

.text-section{
    position: relative;
    top:68px;
    left:50px;
}

.text-section h2{
    margin-bottom: 20px;
}

.text-section p{
    font-size: 18px;
    letter-spacing: 1px;
}

.text-section .sub-heading{
    font-size: 22px;
    margin-top: 0;
}

.text-section > *{
    width:90%;
}


.purple-section{
    padding: 80px;
    background: #3F3965;
    color:#fff;
}

.purple-section .heading-wrapper{
    text-align: center;
}

.purple-section hr{
    background: #373259;
    width:60%;
}

.card{
    float:left;
    width:50%;
    min-height:300px;
    padding:50px;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
/*    border:1px solid white;*/
}

.card:first-child{
    background: rgba(0,0,0,0.04);
}

.card:nth-child(2){
    background: rgba(0,0,0,0.08);
}

.card:nth-child(3){
    background: rgba(0,0,0,0.12);
}

.card:nth-child(4){
    background: rgba(0,0,0,0.16);
}

.card:nth-child(5){
    background: rgba(0,0,0,0.20);
}

.card:nth-child(6){
    background: rgba(0,0,0,0.24);
}


.footer{
    background: #333;
    color:#fff;
    min-height: 200px;
    text-align: center;
}

ul .share-group{
    display: block;
    width:1080px;
    margin: 0 auto;
    padding: 50px;
}

.share-group li{
    margin:30px;
    display: inline-block;
    padding: 10px;
}

.copy{
    padding-bottom: 20px;
}

.main-wrapper{
    background: #444 url("../images/environment.jpg");
    background-attachment: fixed;   /*固定背景图*/
    background-repeat:no-repeat; /*不重复*/
    background-size: cover; /*背景图片伸展*/
    background-position: center center;
}